BILLINGTON, ELIZABETH J.; YAZICI, EMINE ŞULE; LINDNER C.C. The triangle intersection problem for K4 - e designs. Utilitas Mathematica , [S. l.], v. 73, 2007. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/484. Acesso em: 8 may. 2026.